Table 1.

Merits and demerits of Cloud computing are summarized.

Cloud computing
Merits	Demerits
➢Eco-friendly, automated, cost effective and a novel approach. ➢Low manpower requirement with more elasticity and scalability. ➢Efficient in offering quick solutions and access. ➢Helps in connecting users at distant places. ➢Outdated features of the application can be updated with an advanced version. ➢Patients and his related queries can be addressed at central level. ➢Big data based on radiographical images can be stored, managed and analyzed from distant places. ➢If lost data can be retrieved from the central level or repositories ➢Can be accessed from portable smart devices. ➢Chemical as well as biological data can be analyzed with more accuracy. ➢Clinical data can be monitored live. ➢Storage and accessibility of data at different locations can be done. ➢Physiological signals can be monitored by using biosensors and bio-medical instrumentation. ➢Artificial organs can be monitored. ➢Radiological data can be processed. ➢Analogue information in the form of a repetitive signal such as electrocardiogram can be monitored. ➢Chemical, genetic, clinical and patient data analysis.	➢Expense of execution and maintenance of whole system. ➢It's difficult reassemble fragmented data depending upon the algorithm set for respective. ➢Absence of regulations/laws requiring the use and protection of electronic health care. ➢Absence of e-Health Cloud design and development standards. ➢Changes in cloud provider always make data more insecure especially personal identification information data, as risks of existence of previous data with previous cloud provider is always there. ➢Challenges associated Hybrid multiple cloud such as interdependency.